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Wireless Sensor Networks (WSNs) have been the focal point of research over the last several years. Broadcast communication is a key requirement for WSNs since many tasks in the network depend on broadcasting, including critical tasks like querying. Consequently, securing broadcast communication over sensor networks has become an important research challenge. Typically, broadcast communication involves two steps: broadcasting and acknowledging. In the broadcasting phase, the message is broadcast in the network. In the acknowledging phase, nodes that successfully received the broadcast message send an acknowledgment to the broadcast origination node, which in this paper is always the sink.
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